两道9601北美的语法题

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5. Because of its importance in modern living, —in all parts of the world.
(A) algebra is studies in schools and colleges
(B) studying algebra in schools and colleges
(C) and the study of algebra in schools and colleges
(D) in schools and colleges are algebra studies
答案是A，我选的D。我觉得四个选项都很别扭，如果A的studies改成studied就好了

37.The Statue of Liberty is one of the most （celebrating） examples of repousse work, （a process） of （hammering） metal （inside） a mold.
答案是A，为什么呢？怎么改？
谢谢指教！